*{
    margin: 0;
    padding: 0;
}
.header{
    width: 1400px;
    margin: 10px auto;
    line-height: 30px;
    border-bottom: 3px solid #000;
}
.header h1{
    line-height: 50px;
}
.content{
    width: 1400px;
    margin: 10px auto;
}
.list{
    margin: 0 auto;
    width: 1400px;
    list-style: none;
    display: flex;
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
}
.list-item{
    width: 300px;
    display: flex;
    flex-direction: column;
    margin: 10px;
    word-wrap: break-word;
}
.collectList{
    margin: 0 auto;
    width: 1400px;
    list-style: none;
    display: flex;
    flex-direction: column;
}